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Date: Fri, 15 Feb 2013 16:00:09 +0000
From: Wei Liu <wei.liu2@...rix.com>
To: <xen-devel@...ts.xen.org>, <netdev@...r.kernel.org>,
<ian.campbell@...rix.com>, <konrad.wilk@...cle.com>,
<annie.li@...cle.com>
CC: Wei Liu <wei.liu2@...rix.com>
Subject: [PATCH 8/8] netfront: split event channels support
If this feature is not activated, rx_irq = tx_irq. See corresponding netback
change log for details.
Signed-off-by: Wei Liu <wei.liu2@...rix.com>
---
drivers/net/xen-netfront.c | 184 ++++++++++++++++++++++++++++++++++++--------
1 file changed, 152 insertions(+), 32 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index de73a71..ea9b656 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -100,7 +100,12 @@ struct netfront_info {
struct napi_struct napi;
- unsigned int evtchn;
+ /*
+ * Split event channels support, tx_* == rx_* when using
+ * single event channel.
+ */
+ unsigned int tx_evtchn, rx_evtchn;
+ unsigned int tx_irq, rx_irq;
struct xenbus_device *xbdev;
spinlock_t tx_lock;
@@ -344,7 +349,7 @@ no_skb:
push:
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify);
if (notify)
- notify_remote_via_irq(np->netdev->irq);
+ notify_remote_via_irq(np->rx_irq);
}
static int xennet_open(struct net_device *dev)
@@ -633,7 +638,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->tx, notify);
if (notify)
- notify_remote_via_irq(np->netdev->irq);
+ notify_remote_via_irq(np->tx_irq);
u64_stats_update_begin(&stats->syncp);
stats->tx_bytes += skb->len;
@@ -1263,26 +1268,41 @@ static int xennet_set_features(struct net_device *dev,
return 0;
}
-static irqreturn_t xennet_interrupt(int irq, void *dev_id)
+/* Used for tx completion */
+static irqreturn_t xennet_tx_interrupt(int tx_irq, void *dev_id)
{
- struct net_device *dev = dev_id;
- struct netfront_info *np = netdev_priv(dev);
+ struct netfront_info *np = dev_id;
+ struct net_device *dev = np->netdev;
unsigned long flags;
spin_lock_irqsave(&np->tx_lock, flags);
+ xennet_tx_buf_gc(dev);
+ spin_unlock_irqrestore(&np->tx_lock, flags);
- if (likely(netif_carrier_ok(dev))) {
- xennet_tx_buf_gc(dev);
- /* Under tx_lock: protects access to rx shared-ring indexes. */
- if (RING_HAS_UNCONSUMED_RESPONSES(&np->rx))
- napi_schedule(&np->napi);
- }
+ return IRQ_HANDLED;
+}
- spin_unlock_irqrestore(&np->tx_lock, flags);
+/* Used for rx */
+static irqreturn_t xennet_rx_interrupt(int rx_irq, void *dev_id)
+{
+ struct netfront_info *np = dev_id;
+ struct net_device *dev = np->netdev;
+
+ if (likely(netif_carrier_ok(dev) &&
+ RING_HAS_UNCONSUMED_RESPONSES(&np->rx)))
+ napi_schedule(&np->napi);
return IRQ_HANDLED;
}
+/* Used for single event channel configuration */
+static irqreturn_t xennet_interrupt(int irq, void *dev_id)
+{
+ xennet_tx_interrupt(irq, dev_id);
+ xennet_rx_interrupt(irq, dev_id);
+ return IRQ_HANDLED;
+}
+
#ifdef CONFIG_NET_POLL_CONTROLLER
static void xennet_poll_controller(struct net_device *dev)
{
@@ -1451,9 +1471,14 @@ static void xennet_disconnect_backend(struct netfront_info *info)
spin_unlock_irq(&info->tx_lock);
spin_unlock_bh(&info->rx_lock);
- if (info->netdev->irq)
- unbind_from_irqhandler(info->netdev->irq, info->netdev);
- info->evtchn = info->netdev->irq = 0;
+ if (info->tx_irq && (info->tx_irq == info->rx_irq))
+ unbind_from_irqhandler(info->tx_irq, info);
+ if (info->tx_irq && (info->tx_irq != info->rx_irq)) {
+ unbind_from_irqhandler(info->tx_irq, info);
+ unbind_from_irqhandler(info->rx_irq, info);
+ }
+ info->tx_evtchn = info->rx_evtchn = 0;
+ info->tx_irq = info->rx_irq = 0;
xenbus_unmap_ring_vfree(info->xbdev, (void *)info->tx.sring);
free_pages((unsigned long)info->tx.sring, info->tx_ring_page_order);
@@ -1503,11 +1528,86 @@ static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[])
return 0;
}
+static int setup_netfront_single(struct netfront_info *info)
+{
+ int err;
+
+ err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn);
+ if (err < 0)
+ goto fail;
+
+ err = bind_evtchn_to_irqhandler(info->tx_evtchn,
+ xennet_interrupt,
+ 0, info->netdev->name, info);
+ if (err < 0)
+ goto bind_fail;
+ info->rx_evtchn = info->tx_evtchn;
+ info->rx_irq = info->tx_irq = err;
+ dev_info(&info->xbdev->dev,
+ "single event channel, evtchn = %d, irq = %d\n",
+ info->tx_evtchn, info->tx_irq);
+
+ return 0;
+
+bind_fail:
+ xenbus_free_evtchn(info->xbdev, info->tx_evtchn);
+ info->tx_evtchn = 0;
+fail:
+ return err;
+}
+
+static int setup_netfront_split(struct netfront_info *info)
+{
+ int err;
+
+ err = xenbus_alloc_evtchn(info->xbdev, &info->tx_evtchn);
+ if (err)
+ goto fail;
+ err = xenbus_alloc_evtchn(info->xbdev, &info->rx_evtchn);
+ if (err)
+ goto alloc_rx_evtchn_fail;
+
+ err = bind_evtchn_to_irqhandler(info->tx_evtchn,
+ xennet_tx_interrupt,
+ 0, info->netdev->name, info);
+ if (err < 0)
+ goto bind_tx_fail;
+ info->tx_irq = err;
+
+ err = bind_evtchn_to_irqhandler(info->rx_evtchn,
+ xennet_rx_interrupt,
+ 0, info->netdev->name, info);
+ if (err < 0)
+ goto bind_rx_fail;
+
+ info->rx_irq = err;
+
+ dev_info(&info->xbdev->dev,
+ "split event channels, tx_evtchn/irq = %d/%d, rx_evtchn/irq = %d/%d",
+ info->tx_evtchn, info->tx_irq,
+ info->rx_evtchn, info->rx_irq);
+
+ return 0;
+
+bind_rx_fail:
+ unbind_from_irqhandler(info->tx_irq, info);
+ info->tx_irq = 0;
+bind_tx_fail:
+ xenbus_free_evtchn(info->xbdev, info->rx_evtchn);
+ info->rx_evtchn = 0;
+alloc_rx_evtchn_fail:
+ xenbus_free_evtchn(info->xbdev, info->tx_evtchn);
+ info->tx_evtchn = 0;
+fail:
+ return err;
+}
+
static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
{
struct xen_netif_tx_sring *txs;
struct xen_netif_rx_sring *rxs;
int err;
+ unsigned int feature_split_evtchn;
struct net_device *netdev = info->netdev;
unsigned int max_tx_ring_page_order, max_rx_ring_page_order;
int i;
@@ -1527,6 +1627,12 @@ static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
}
err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
+ "feature-split-event-channels", "%u",
+ &feature_split_evtchn);
+ if (err < 0)
+ feature_split_evtchn = 0;
+
+ err = xenbus_scanf(XBT_NIL, info->xbdev->otherend,
"max-tx-ring-page-order", "%u",
&max_tx_ring_page_order);
if (err < 0) {
@@ -1598,20 +1704,17 @@ static int setup_netfront(struct xenbus_device *dev, struct netfront_info *info)
if (err < 0)
goto grant_rx_ring_fail;
- err = xenbus_alloc_evtchn(dev, &info->evtchn);
+ if (feature_split_evtchn)
+ err = setup_netfront_split(info);
+ else
+ err = setup_netfront_single(info);
+
if (err)
- goto alloc_evtchn_fail;
+ goto setup_evtchn_fail;
- err = bind_evtchn_to_irqhandler(info->evtchn, xennet_interrupt,
- 0, netdev->name, netdev);
- if (err < 0)
- goto bind_fail;
- netdev->irq = err;
return 0;
-bind_fail:
- xenbus_free_evtchn(dev, info->evtchn);
-alloc_evtchn_fail:
+setup_evtchn_fail:
xenbus_unmap_ring_vfree(info->xbdev, (void *)info->rx.sring);
grant_rx_ring_fail:
free_pages((unsigned long)info->rx.sring, info->rx_ring_page_order);
@@ -1696,11 +1799,26 @@ again:
}
}
- err = xenbus_printf(xbt, dev->nodename,
- "event-channel", "%u", info->evtchn);
- if (err) {
- message = "writing event-channel";
- goto abort_transaction;
+ if (info->tx_evtchn == info->rx_evtchn) {
+ err = xenbus_printf(xbt, dev->nodename,
+ "event-channel", "%u", info->tx_evtchn);
+ if (err) {
+ message = "writing event-channel";
+ goto abort_transaction;
+ }
+ } else {
+ err = xenbus_printf(xbt, dev->nodename,
+ "event-channel-tx", "%u", info->tx_evtchn);
+ if (err) {
+ message = "writing event-channel-tx";
+ goto abort_transaction;
+ }
+ err = xenbus_printf(xbt, dev->nodename,
+ "event-channel-rx", "%u", info->rx_evtchn);
+ if (err) {
+ message = "writing event-channel-rx";
+ goto abort_transaction;
+ }
}
err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u",
@@ -1814,7 +1932,9 @@ static int xennet_connect(struct net_device *dev)
* packets.
*/
netif_carrier_on(np->netdev);
- notify_remote_via_irq(np->netdev->irq);
+ notify_remote_via_irq(np->tx_irq);
+ if (np->tx_irq != np->rx_irq)
+ notify_remote_via_irq(np->rx_irq);
xennet_tx_buf_gc(dev);
xennet_alloc_rx_buffers(dev);
--
1.7.10.4
--
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